iPhones keep getting better every year. They still have limitations when it comes to battery life. The mophie Juice Pack Access Battery Case is a handy accessory that extends the life of your iPhone to 31 hours (talk time). It gives you full access to the Lightning port, so you can connect your headphones while you charge.
The Juice Pack Access not only powers your phone but also has rubberized support pads to protect your phone from drops. It can be recharged wirelessly or via a USB-C connection. The battery capacity is 2,000 mAh.[where to get it]